Nina Farliana, Inaya Sari Melati, Khasan Setiaji, Hanif Hardianto. “The Effect of Individual and Social Integration on Economic Student Retention ”. International Journal of Advanced Science and Technology, Vol. 29, no. 05, Apr. 2020, pp. 2938 -48, http://sersc.org/journals/index.php/IJAST/article/view/11415.